手术中医生切除了病人脚部的坏死组织以防止感染扩散。

The surgeon removed the ___necrotic tissue from the patient's foot to prevent the infection from spreading.

医生切除了病人脚上坏死的组织以防止感染扩散。

The surgeon removed the ___necrotic tissue from the patient's foot to prevent infection from spreading.